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Expanding on the critically acclaimed In the Womb and In the Womb: Animals, National Geographic explores the extraordinary, never-before-seen world of twins, triplets and quadruplets as they develop in utero. Utilizing groundbreaking technology and amazing 4-D ultrasound images, watch quadruplets as they develop in utero and engage in their first interactions with each other. Can multiples hold hands? When one pushes, does the other push back? Does prenatal game-playing carry over into early childhood?

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Following last year's critically acclaimed special, In the Womb, National Geographic takes you inside the hidden world of animal pregnancy in a way never before possible in a remarkable new special, In the Womb: Animals. Featuring state-of-the art visual effects, computer graphics and real-time, moving 4-D ultrasound imagery to take viewers inside the unique world of animal fetal development, these remarkable pictures shed light on how an elephant, a dolphin and a dog develop in the womb.

Revolutionary 3-D and 4-D ultrasound imagery sheds light on the delicate, dark world of a fetus as never before. Cutting-edge technology makes it possible for us to explore each trimester in amazing new detail. In In the Womb, follow a rare fetoscope operation, performed in utero with the hope of correcting life threatening complications before birth.

From the moment of conception, every human embryo embarks on an incredible nine month journey of development. Now, cutting-edge technology makes it possible for us to open a window into the hidden world of the fetus and explore each trimester in amazing new detail. Revolutionary 3-D and 4-D ultrasound imagery sheds light on the delicate, dark world of a fetus as never before and follows a rare fetoscope operation, performed in utero with the hope of correcting life threatening complications before birth.

In the latest installment of the critically acclaimed In the Womb series, In the Womb: Extreme Animals explores the extraordinary methods of reproduction and gestation of four different animals: sharks, emperor penguins, red kangaroos and parasitic wasps. Using real-time 4-D ultrasound images and fetal imaging techniques, this program follows unusual developmental challenges in utero.

The latest installment of National Geographic's popular series In the Womb follows the embryonic and fetal journey of one of nature's most fascinating reproductive miraclesidentical twins. Witness key momentsfrom the spontaneous splitting of a single fertilized egg into identical twins to the major milestones of twin fetal development, ending with their dramatic births. Along the way, learn how skin color is formed; what happens when aberrations in early development occur, producing conjoined twins; and how twins with ambiguous genitalia (hermaphrodites) can develop. Meet a pair of identicals who were separated at birth and met for the first time four decades later. Then, see dramatic 4-D ultrasound images of twins interacting in the womb in real time.

The dog is the ultimate human creation. With 400 breeds and counting, the dog is more varied in size and behavior than any other species on the planet. National Geographic looks at man's evolutionary manipulation of dogs' appearance, talents and temperamentand the accelerating efforts to create breeds to suit our needs (more than 80 percent of today's breeds did not exist 150 years ago). From desirable traits like supersensitive hearing and smell to the unintended consequences of genetic diseases, learn how nature and man have partnered to deliberately create new and specialized versions of man's best friend.

For over 500 million years, the jellyfish has survived in our oceans. Today, global warming and pollution may be contributing to a population explosion, as billions of these sometimes venomous creatures increasingly swarm around our beaches and shorelines. And though they have no bones, blood or brain, some jellyfish are armed with a deadly arsenal unlike any other on the planet. National Geographic dissects the fascinating physiology of this living fossil, from its 24 clustered eyes down to the tips of its stinging tentacles, and examines how man's impact on the environment may be creating a growing invasion.

In a remote Chinese desert, archaeologists have unearthed mummies that are thousands of years old, many with Indo-European features such as blond hair and blue eyes. Where did they come from? Dr. Spencer Wells, National Geographic explorer-in-residence and director of the National Geographic Genographic Project, goes on a mission to use advanced technology to decode the genetic identity of these unusually well-preserved mummies and open a unique window into the ancient migrations of mankind.

Human babies come into this world entirely helplessunable to walk, talk, or feed themselves. And, as any parent can testify, a remarkable transformation occurs over their first year. But what's happening behind what you can simply observe? From first breath to first step, National Geographic sheds light on the amazing developments in the first 12 months of life and how new research indicates that these growing abilities are much more flexible than previously known. Follow leading scientists as they study the remarkable plasticity of a very young brain, measure how early experiences influence the course of human development and deconstruct how babies can learn languages and even grasp math!

The giant saltwater crocodile, the "saltie," is perhaps the most successful predator the world has ever seen. It has survived unchanged for 100 million years. National Geographic uncovers the secrets of this ultimate predator, which has the most powerful jaws since T-rex, the most complex heart in the animal kingdom and a brain with unexpected intelligence. Examine the remarkable features of the crocfrom its finely tuned pressure sensors used to detect prey to its lethal predation techniques; from its remarkable pulverizing stomach to its powerful immune system.

Scientists have long debated one of the greatest mysteries of science. What caused the mass extinction of mammoths around 13,000 years ago? A look at science in the making, National Geographic follows a team of investigators as they assemble one theory for what might have happened to the mammoths, which reigned over the landscapes of North America for more than 1 million years. Could the clues point to the biggest cosmic impact humans have ever witnessed?